The key number: 36%. That's the rate at which advertising revenues grew. And it's noticeably higher than ad sales growth in the second quarter, which had flagged at 28%. Excluding the impact of foreign currency changes, ad sales would have risen 43% in the third quarter.

Mobile revenues, a key metric for a company that until recently had zero mobile ad revenues and offered little of note to its mobile users, were 14% of the total $1.09 billion in ad sales.

The other key number: 9%. That's how much shares are rising in after-hours trading. Shares of FB rose a little less than 1%, to $19.50, in trading today. That's still only a little over half of the IPO price.

Also, a new study from Facebook ad firm TBG Digital shows that mobile newsfeed ads elicit far more clicks than more conventional ads. Click-through rates on the ads are 23 times higher than desktop newsfeed ads or those right-hand side "Marketplace" ads.

Facebook still faces many challenges, such as the need to provide a better mobile experience for users and advertisers. And thanks to rising expenses, including stock compensation and related costs--up 64% from a year ago--it's actually losing money on a GAAP basis. But if advertising is returning, whether it's from more interest in its social and mobile ads, in the Facebook ad exchange that's getting a lot of attention, or even in the new Gifts e-commerce service, that's good news.

The call begins. Zuckerberg will talk about the vision and strategy of the company--make the world more connected, etc. Three pillars to the strategy:

1) Build the best mobile product. This is the most misunderstood pillar. Mobile allows us to reach way more people, people spend more time on mobile devices, and monetization should be even better than on the desktop.

2) Improve the Facebook platform.

3) Strong monetization engine. On mobile, ads will be more like TV--more integrated into the core product experience, rather than on the side. We're starting to see better ad products for people and better results for advertisers.

I want to dispose of this notion that we can't make money on mobile. Until recently, Facebook didn't even try.

Mark, the call isn't a verbal race--we can't keep up! Guess we'll wait for more color from the Q&A.

Now to monetization: We're just getting started on this. A few of the most exciting products:

* Mobile app installs.

* Facebook Exchange and Custom Audiences.

* Gifts launch.

There's a lot more we plan to do.

COO Sheryl Sandberg chimes in. For brand marketers like Wal-Mart and Procter & Gamble, Facebook allows them to reach customers, build awareness, and drive affinity. For direct marketers, they can tap into Facebook's incredibly accurate targeting capabilities. In other words, Facebook can help marketers in the entire marketing funnel.